I had success hacking /etc/sysctl.d/bindv6only.conf . I have no idea how to get to any "Sun Java Control Panel -> Java -> View -> User -> Runtime Paremeters" that you are talking about. And even if I did, I have to make this change to several computers, so you had better tell me what file to stick the "-Djava.net.preferIPv4Stack=true" into, so I can propagate the file instead of having to play with some interactive thing.
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